What inspired the choice to make the story revolve around a mysterious key?
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La primera llave (Serie Ulysses Moore 6)

La primera llave (Serie Ulysses Moore 6)
La discussion entre lecteurs est ouverte maintenant. Un auteur vérifié pourra intervenir après avoir revendiqué ce profil.
What inspired the choice to make the story revolve around a mysterious key?
Did anyone else feel the story balanced adventure and humor perfectly?
How did the author decide on the magical world’s rules and limitations?